Polyanthranilides—II. Synthesis and characterization of polyamides from 6-methyl and 6,7-methylenedioxybenz-3,1-oxazin-2,4-dione

Ring-scission polymerizations of 6-methyl and 6,7-methylenedioxybenz-3,1-oxazin-2,4-dione have been studied in the presence of catalysts such as aq HCl, the corresponding anthranilamide, N-methylaniline, o-chloroaniline and acid amides under various conditions. These substances underwent ring-scission polymerization affording polyanthranilides in the presence of the first four catalysts under appropriate experimental conditions. The samples were insoluble in all organic solvents including formic acid. They were soluble in sulphuric acid with degradation. They were characterized by i.r. and thermogravimetric analysis.